Ramadhan, I., and R. Fitriani. “Optimalisasi Efektivitas Preventive Maintenance Berbasis Usage-Based Maintenance Untuk Mengurangi Downtime Di PT PQR”. Journal of Integrated System, vol. 7, no. 2, Jan. 2025, pp. 166-83, doi:10.28932/jis.v7i2.9760.